How to set an event for the appearance of data in a certain block in a meteor?

Question

MongoDB

Hello,
When you click on the submit button, it inserts into the database.
After , when a new record in the collection appears in the database (previously processed by the backend and inserted into a new table), it is pulled up by find by id.
How to do something when clicking submit , css changed and then when a record appeared in the front in the block, everything returned to the usual moment.
Actually, you need to trigger the moment when a new record appears in a certain block.
Thanks in advance!